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[K12OSN] Too weird for words - Epia-V mobo problem and solution



My experience with the VIA boards is that they don't draw enough current
on the +12VDC line to satisfy the power supply requirements. On many
145-200 watt supplies, the the 12 VDC current spec is 200ma. min. On
many ATX power supplies, the +12VDC output is unregulated and with no
load, the voltage exceeds the limits allowed by onboard voltage
monitoring circuitry. That's why a 3.5" hdd will usually allow the power
supply to start, and a 2.5" hdd won't. On some supplies, I've removed
resistors in the 12VDC sensing circuit, effectively disabling the 12VDC
sense circuitry. This tends to be power supply specific. For 200ma., you
need a 2.5 watt, 60 ohm resistor. Now you're dissapating almost as much
as the CPU!

Hope this helps.

Rick Barnich




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